Abstract: Better quality with high productivity is the prime concern of manufacturing firms to remain in business in today’s competitive manufacturing market. CNC machines provide this opportunity. However, the performance of a cutting tool in high-speed CNC machining plays a key role in achieving high productivity and better quality. Various hard coatings have been developed to increase the performance of the cutting tools. In this study performance of various coated carbide tools in term of wear rate & surface roughness obtained during the CNC machining have been included.

Cemented carbide tools are most desirable in high production in the competitive market of manufacturing industries. A demand for enhanced productivity is the key factor for the improvement of cutting tools with respect to the achievement of a superior tribological attainment and wear-resistance. The tool wear of cutting tools has a very strong impact on the product quality as well as on the efficiency of the machining processes. Despite the ongoing automation high level in the machining industry, a few key issues prevent complete automation of the entire turning and milling process. One of these issues is tool wear, which is usually measured at the large of the machine tool. Therefore, its characterization in a row is essential [1].

This resulted in developing hard coating for cutting tools; these hard coatings are thin films of one layer to hundreds of layers. These hard coatings have been proven to increase the tool life by as much as 10 folds through slowing down the wear phenomenon of the cutting tools. This increase in tool life allows for less frequent tool changes, therefore increasing the batch sizes that could be manufactured and in turn, not only reducing manufacturing cost, but also reducing the setup time as well as the setup cost. In addition to increasing the tool life, hard coating deposited on cutting tools allows for improved and more consistent surface roughness of the machined workpiece [2].